Revert "s3cfb: Notify userspace of vsync using sysfs, make uevents optional"

This reverts commit a94c1392ea8f1bc379ad3863ad96f00e66d9fd52.
Revert "temasek defconfig: enable sysfs vsync notifications"

This reverts commit 62524069cbb66039c2237a34ad5c94fd2bb34216.